CN110627098A - High-efficient environmental protection production system of solid polyaluminium chloride - Google Patents
High-efficient environmental protection production system of solid polyaluminium chloride Download PDFInfo
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- CN110627098A CN110627098A CN201910867032.4A CN201910867032A CN110627098A CN 110627098 A CN110627098 A CN 110627098A CN 201910867032 A CN201910867032 A CN 201910867032A CN 110627098 A CN110627098 A CN 110627098A
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 71
- 239000007787 solid Substances 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 230000007613 environmental effect Effects 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 188
- 238000001704 evaporation Methods 0.000 claims abstract description 49
- 230000008020 evaporation Effects 0.000 claims abstract description 48
- 238000001035 drying Methods 0.000 claims abstract description 42
- 238000001816 cooling Methods 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims description 92
- 238000000926 separation method Methods 0.000 claims description 82
- 238000003860 storage Methods 0.000 claims description 79
- 238000007599 discharging Methods 0.000 claims description 40
- 238000001291 vacuum drying Methods 0.000 claims description 33
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 26
- 230000000694 effects Effects 0.000 claims description 24
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 23
- 229910000856 hastalloy Inorganic materials 0.000 claims description 23
- 239000010936 titanium Substances 0.000 claims description 23
- 229910052719 titanium Inorganic materials 0.000 claims description 23
- 238000005406 washing Methods 0.000 claims description 19
- 239000003345 natural gas Substances 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- 239000010865 sewage Substances 0.000 claims description 11
- 239000011152 fibreglass Substances 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 9
- -1 polytetrafluoroethylene Polymers 0.000 claims description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 238000004064 recycling Methods 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 6
- 239000007864 aqueous solution Substances 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 33
- 230000006872 improvement Effects 0.000 description 32
- 239000002994 raw material Substances 0.000 description 15
- 239000007789 gas Substances 0.000 description 12
- 239000000047 product Substances 0.000 description 11
- 239000002351 wastewater Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000008399 tap water Substances 0.000 description 8
- 235000020679 tap water Nutrition 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 239000000203 mixture Substances 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 238000003303 reheating Methods 0.000 description 3
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000009290 primary effect Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000009291 secondary effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- VTEIFHQUZWABDE-UHFFFAOYSA-N 2-(2,5-dimethoxy-4-methylphenyl)-2-methoxyethanamine Chemical compound COC(CN)C1=CC(OC)=C(C)C=C1OC VTEIFHQUZWABDE-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000011363 dried mixture Substances 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 229920000592 inorganic polymer Polymers 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000012629 purifying agent Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/48—Halides, with or without other cations besides aluminium
- C01F7/56—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Abstract
The invention discloses a high-efficiency environment-friendly production system of solid polyaluminium chloride, belonging to the technical field of polyaluminium chloride production. The high-efficiency environment-friendly production system of the solid polyaluminium chloride comprises an evaporation concentration system, a vacuum cooling and drying system and a flash evaporation and drying system which are sequentially connected. The evaporation concentration system, the vacuum cooling drying system and the flash evaporation drying system designed by the invention can produce the polyaluminum chloride aqueous solution with the solid content of 30 percent into the powdery polyaluminum chloride with the solid content of more than 91 percent, really realize automatic and clean production, and the quality index of the produced polyaluminum chloride product reaches the new polyaluminum chloride national standard requirements of high alumina content, high basicity value, low water insoluble substance value and low heavy metal value, and simultaneously realize the advantages of product diversification, low energy consumption, safety, environmental protection, high productivity and material recycling.
Description
Technical Field
The invention relates to the technical field of polyaluminium chloride production, in particular to a high-efficiency environment-friendly production system of solid polyaluminium chloride.
Background
Polyaluminum chloride is commonly called as a water purifying agent, also called polyaluminum chloride, abbreviated as polyaluminum, and called PAC in English; it is a polyhydroxy, multinuclear complex cationic inorganic polymer flocculant, the solid product appearance is red brown, yellow or white solid powder, its chemical molecular formula is [ Al2(OH)nCl6-n]m(in the formula, n is more than or equal to 1 and less than or equal to 5, m is less than or equal to 10), wherein m represents the polymerization degree, n represents the neutral degree of the PAC product, is easy to dissolve in water, has stronger bridging adsorbability, and finally generates [ Al ] along with the physical changes of electrochemistry, agglomeration, adsorption, precipitation and the like in the hydrolysis process2(OH)3(OH)3]Thereby achieving the purpose of purification.
The polyaluminium chloride is fundamentally different from the traditional inorganic coagulant in that the traditional inorganic coagulant is low-molecular crystal salt, the polyaluminium chloride is structurally composed of multi-element carboxyl complex with various forms, the flocculation precipitation speed is high, the applicable pH value range is wide, the corrosion to pipeline equipment is avoided, the water purification effect is obvious, the heavy metal ions such as water chromatics SS, COD, BOD, arsenic, mercury and the like can be effectively supported, and the polyaluminium chloride is widely applied to the fields of drinking water, industrial water and sewage treatment.
The current solid polyaluminium chloride production system consists of a coal-fired heat-conducting oil boiler, a roller drying system and a flash evaporation drying system. The existing solid polyaluminium chloride reaction device generally has the following defects: 1) the coal-fired heat conduction oil boiler directly discharges hydrogen chloride and dust pollution factors into the atmosphere in the production process, so that serious air pollution is caused; 2) the cylinder drying system who uses, the flow sets up rationally inadequately, makes that the workshop raise dust is heavy, waste gas scattered discharge is big, the operation is original can not effective control, product quality is not conform to the new national standard of poly aluminium, the workshop is clean poor to lead to drying energy consumption cost too high, and the handling of the dry solid poly aluminium chloride of process cylinder is also more wasted time and energy.
Disclosure of Invention
In view of the above, the present invention aims to provide a set of efficient and environment-friendly production system for solid polyaluminium chloride, which has the advantages of low cost, safety, environmental protection and high production efficiency.
The specific process system scheme of the invention is as follows:
the utility model provides a high-efficient environmental protection production system of solid polyaluminium chloride, includes the evaporation concentration system, vacuum cooling drying system and the flash drying system that connect gradually.
Further, the evaporative concentration system comprises a triple-effect counter-current evaporation system;
the triple-effect countercurrent evaporation system is sequentially connected with the preheating device, the triple-effect unit, the triple-effect discharging device, the double-effect unit, the double-effect discharging device, the first-effect unit and the first-effect discharging device; the three-effect unit, the two-effect unit and the one-effect unit respectively comprise a separating device, a circulating device and a heating device which are sequentially connected.
Further: the heating devices of the three-effect unit and the two-effect unit are made of graphite, hastelloy or titanium materials; the heating device of the first effect unit is made of hastelloy or titanium; the separation device is made of glass fiber reinforced plastic, hastelloy or titanium material; the circulating device is made of polytetrafluoroethylene, Hastelloy or a titanium material; the three-effect discharging device, the two-effect discharging device and the one-effect discharging device are all made of polytetrafluoroethylene, Hastelloy or titanium materials.
Further, the triple-effect unit comprises a triple-effect separation device, a triple-effect circulation device and a triple-effect heating device which are sequentially connected; the double-effect unit comprises a double-effect separation device, a double-effect circulation device and a double-effect heating device which are sequentially connected; the first effect unit comprises a first effect separation device, a first effect circulation device and a first effect heating device which are sequentially connected.
Wherein the working temperature of the two-effect heating device and the one-effect heating device is less than 150 ℃, and the working pressure is less than 1.6 MPa; the working temperature of the primary heating device is less than 260 ℃, and the working pressure is less than 1.6 MPa; the working temperature of the separation device is less than 150 ℃, and the working pressure is less than-0.099 MPa; the working temperature of the circulating device is less than 150 ℃, and the working pressure is less than 1.6 MPa; the working temperature of the three-effect discharging device, the two-effect discharging device and the one-effect discharging device is less than 150 ℃, and the working pressure is less than 1.6 MPa.
Further, a feed inlet of the preheating device is connected with an outlet of the raw material liquid pipeline, and a discharge outlet of the preheating device is connected with a first feed inlet of the three-effect separation device; a first discharge port of the three-effect separation device is connected with a feed port of the three-effect discharge device, and a second discharge port of the three-effect separation device is connected with a feed port of the three-effect circulation device; the discharge hole of the three-effect circulating device is connected with the feed inlet of the three-effect heating device; the discharge hole of the three-effect heating device is connected with the second feed inlet of the three-effect separation device;
the discharge hole of the three-effect discharge device is connected with the first feed hole of the two-effect separation device; a first discharge port of the two-effect separation device is connected with a feed port of the two-effect discharge device, a second discharge port of the two-effect separation device is connected with a feed port of the two-effect circulation device, and a steam outlet of the two-effect separation device is connected with a steam inlet of the three-effect heating device; the discharge hole of the double-effect circulating device is connected with the feed inlet of the double-effect heating device; the discharge hole of the two-effect heating device is connected with the second feed inlet of the two-effect separation device;
the discharge hole of the secondary effect discharge device is connected with the first feed hole of the primary effect separation device; the first discharge port of the first-effect separation device is connected with the feed inlet of the first-effect discharge device, the second discharge port of the first-effect separation device is connected with the feed inlet of the first-effect circulation device, and the steam outlet of the first-effect separation device is connected with the steam inlet of the second-effect heating device; the discharge hole of the first-effect circulating device is connected with the feed inlet of the first-effect heating device; the discharge hole of the first effect heating device is connected with the second feed inlet of the first effect separation device.
Further, the preheating device is a preheater; the three-effect heating device, the two-effect heating device and the one-effect heating device are all circulating heaters; the three-effect circulating device, the two-effect circulating device and the one-effect circulating device are circulating pumps; the three-effect separation device, the two-effect separation device and the one-effect separation device are all separators.
Further, the evaporation concentration system also comprises a tail treatment system; the tail treatment system is connected with a three-effect countercurrent evaporation system; the tail treatment system comprises a first water storage device, a circulating water device, a surface condensing device and a sewage treatment system which are connected in sequence.
Further, the tail treatment system also comprises a vacuum pump and a water cooling tower arranged on the first water storage device; the vacuum pump is connected with the surface condensing device. Wherein the water cooling tower is made of glass fiber reinforced plastic, the working temperature is less than 80 ℃, the working pressure is normal pressure, the working temperature of the vacuum pump is a large fan or a mechanical pump vacuum pump is less than 80 ℃, and the working pressure is less than-0.099 MPa.
Furthermore, a first water inlet of the first water storage device is connected with a tap water pipe, a water outlet of the first water storage device is connected with a water inlet of the circulating water device, and a second water inlet of the first water storage device is connected with a water outlet of the surface condensing device; the water outlet of the circulating water device is connected with the water inlet of the surface condensing device; the steam inlet of the surface condensing device is connected with the steam outlet of the three-effect separation device; the wastewater inlet of the sewage treatment system is connected with the wastewater outlet of the surface condensing device, the condensed water outlet of the three-effect heating device and the condensed water outlet of the two-effect heating device; an air outlet is formed in the top end of a wastewater outlet of the surface condensing device; the air outlet is connected with the air inlet of the vacuum pump.
Further, the first water storage device is a water pool; the circulating water device is a circulating water pump; the surface condensing device is a surface condenser.
Further, the water pool is made of acid-resistant anticorrosive cement or glass fiber reinforced plastic; the surface condenser is made of graphite, hastelloy or titanium. Wherein the working temperature of the water pool is less than 80 ℃, the working pressure is normal pressure, the working temperature of the surface condenser is less than 150 ℃, and the working pressure is less than 1.6 MPa.
Further, the evaporation concentration system also comprises a material storage device; and the storage devices are connected with a triple-effect countercurrent evaporation system and a vacuum cooling and drying system.
Further, the feed inlet of the storage device is connected with the discharge outlet of an effective discharge device.
Further, the storage device is a heat preservation storage tank.
Further, the heat-preservation storage tank is made of glass fiber reinforced plastic, hastelloy or titanium materials. Wherein, the working temperature of the heat preservation storage tank is less than 140 ℃, and the working pressure is normal pressure.
Further, the system also comprises a natural gas heat transfer oil system; the natural gas heat conduction oil system comprises a high-temperature heat conduction oil area and a low-temperature heat conduction oil area; the high-temperature heat conduction oil area is connected with a heat conduction oil inlet end of the first-effect unit; the low-temperature heat conduction oil area is connected with a heat conduction oil outlet end of the preheating device, a heat conduction oil outlet end of the first effect unit and a heat conduction oil outlet end of the storage device.
Further, a heat conduction oil outlet of the high-temperature heat conduction oil area is connected with a heat conduction oil inlet of the first-effect heating device; the heat conduction oil outlet of the primary heating device is connected with the heat conduction oil inlet of the preheating device and the heat conduction oil inlet of the storage device; and the heat conduction oil inlet of the low-temperature heat conduction oil area is connected with the heat conduction oil outlet of the preheating device, the heat conduction oil outlet of the one-effect heating device and the heat conduction oil outlet of the storage device.
Further, the natural gas heat conduction oil system is a natural gas heat conduction oil boiler. Wherein, the natural gas heat conduction oil boiler is adopted to replace the original coal-fired boiler, thereby reducing the discharge amount of pollution factors and simultaneously reducing the treatment cost of polluted gas.
Further, the vacuum cooling and drying system comprises a filtering device, a feeding device, a tube array heating device and a vacuum drying device which are connected in sequence; the vacuum cooling drying system also comprises a tailing processing system; the tailing processing system comprises a cyclone separation device, a mixing and condensing device, an injection device and a second water storage device which are connected in sequence; the second water storage device and the mixed condensing device.
Further, the feeding device is made of polytetrafluoroethylene, hastelloy or a titanium material; the tube nest heating device is made of hastelloy or titanium materials. Wherein the working temperature of the feeding device is less than 140 ℃, the working pressure is less than 1.6MPa, the working temperature of the tube array heating device is less than 180 ℃, and the working pressure is less than 1.6 MPa.
Further, a feed inlet of the filtering device is connected with a discharge outlet of the storage device, and a discharge outlet of the filtering device is connected with a feed inlet of the feeding device; the discharge hole of the feeding device is connected with the feed inlet of the tube array heating device; and the discharge hole of the tube array heating device is connected with the feed inlet of the vacuum drying device.
Furthermore, a heat conduction oil inlet of the tube array heating device is connected with a heat conduction oil outlet of the high-temperature heat conduction oil area, and a heat conduction oil outlet of the tube array heating device is connected with a heat conduction oil inlet of the storage device.
Further, the filtering device is a filter; the feeding device is a feeding gear pump; the tube array heating device is a tube array heater; the vacuum drying device is a rotary scraper vacuum dryer.
Further, a powder remover is arranged in the vacuum drying device; the vacuum degree in the vacuum drying device is between-0.092 MPa and-0.085 MPa; the feeding amount of the vacuum drying device is 6.5-7.5T/h.
The vacuum drying device is mainly made of hastelloy or a titanium material, the working temperature of the vacuum drying device is less than 100 ℃, the vacuum drying device cannot adopt carbon steel, the service life of the vacuum drying device can be shortened due to certain corrosivity, and the powder remover can effectively reduce powder brought out by vacuum airflow. If the feeding amount of the rotary scraper vacuum dryer is less than 6.5T/h, a tube array heating device connected with the vacuum drying device is blocked, and if the feeding amount is more than 7.5T/h, the drying effect of the vacuum drying device is reduced.
Further, the tailing processing system also comprises a first circulating water device, a second circulating water device and a third circulating water device; the first circulating water devices are connected with the spraying device and the second water storage device; the second circulating water devices are connected with the second water storage device and the sewage treatment system; and the third circulating water devices are connected with the mixed condensing device and the second water storage device.
Further, a gas discharge hole of the vacuum drying device is connected with a feed hole of the cyclone separation device; the gas discharge hole of the cyclone separation device is connected with the feed inlet of the mixing and condensing device; the air outlet of the mixing and condensing device is connected with the air inlet of the injection device; the first water inlet of the second water storage device is connected with a tap water pipeline, the first water outlet of the second water storage device is connected with the water inlet of the first circulating water device, the second water outlet of the second water storage device is connected with the water inlet of the second circulating water device, and the third water outlet of the second water storage device is connected with the water inlet of the third circulating water device; the water outlet of the first circulating water device is connected with the water inlet of the spraying device; the water outlet of the spraying device is connected with the second water inlet of the second water storage device; the water outlet of the second circulating water device is connected with the wastewater inlet of the sewage treatment system; the water outlet of the third circulating water device is connected with the water inlet of the mixed condensing device; and the water outlet of the mixing and condensing device is connected with the third water inlet of the second water storage device.
Further, the cyclone separation device is a cyclone separator; the mixed condensing device is an atmospheric condenser; the spraying device is a water spraying vacuum pump; the second water storage device is a water tank.
Further, the cyclone separator is made of glass fiber reinforced plastic, hastelloy or titanium material; the atmospheric condenser is made of glass fiber reinforced plastic, polytetrafluoroethylene, Hastelloy or titanium material; the water jet vacuum pump is made of glass fiber reinforced plastic. Wherein the working temperature of the cyclone separator is less than 80 ℃, and the working pressure is less than-0.099 MPa; the working temperature of the atmospheric condenser is less than 80 ℃, and the working pressure is less than-0.099 Mpa; the working temperature of the vacuum pump is less than 80 ℃, and the working pressure is less than-0.099 MPa.
Further, a water cooling tower is arranged on the second water storage device. Wherein the water cooling tower is made of glass fiber reinforced plastic.
Further, a solid discharge port of the vacuum drying device is provided with a double-screw block discharging machine.
Further, the double-screw block discharging machine is made of hastelloy or a titanium material. Wherein the working temperature of the double-screw block discharging machine is less than 100 ℃, and the working pressure is less than 3 MPa.
Further, a condensed water system is arranged at a solid discharge port of the vacuum drying device; and a water inlet of the condensed water system is connected with a tap water pipeline, and a water outlet of the condensed water system is connected with a third water inlet of the second water storage device.
Further, the flash evaporation drying system comprises an air blowing device, an air heating device, a flash evaporation device, a first cyclone separation device, a second cyclone separation device, an air inducing device and a washing device which are sequentially connected.
Further, an air inlet of the air blowing device is connected with air, and an air outlet of the air blowing device is connected with an air inlet of the air heating device; the air outlet of the air heating device is connected with the air inlet of the flash evaporation device; the feed inlet of the flash evaporation device is connected with the solid discharge outlet of the vacuum cooling and drying system, and the discharge outlet of the flash evaporation device is connected with the feed inlet of the first cyclone separation device; a second discharge hole of the first cyclone separation device is connected with a feed inlet of the second cyclone separation device; the air outlet of the second cyclone separation device is connected with the air inlet of the induced draft device; and the air outlet of the induced draft device is connected with the air inlet of the washing device.
Further, a first discharge hole of the first cyclone separation device is a powder product outlet; and a discharge hole of the second cyclone separation device is an outlet of a product in the powder industry.
Further, the air blowing device is an air blower; the air heating device is an air heater; the flash evaporation device is a flash evaporation tower; the first cyclone separation device and the second cyclone separation device are both cyclone separators; the induced draft device is an induced draft fan; the washing device is a spray washing tower.
Further, the washing device also comprises an exhaust device and a fourth circulating water device which are arranged at the top of the washing device; the water inlet of the fourth circulating water device is connected with a tap water pipeline and the water outlet of the washing device, and the water outlet of the fourth circulating water device is connected with the first water inlet and the second water inlet of the washing device; and the material at the discharge port of the washing device is recycled.
The invention has the beneficial effects that:
1) the evaporation concentration system designed by the invention can improve the solid content of the polyaluminum chloride aqueous solution from 30-35% to 60-65%, has the advantages of high treatment efficiency and low cost, and effectively improves the subsequent treatment efficiency;
2) the vacuum cooling and drying system designed by the invention can produce the polyaluminum chloride aqueous solution with the solid content of 60-65% into blocky polyaluminum chloride with the solid content of 72-77%, and the whole process has no waste gas and waste water discharge, and has the advantages of high production efficiency, safety and environmental protection;
3) by the evaporation concentration system, the vacuum cooling and drying system and the flash evaporation drying system designed by the invention, the polyaluminum chloride aqueous solution with the solid content of 30-35% can be produced into the powdery polyaluminum chloride with the solid content of more than 91-94%, the automatic and clean production is really realized, the quality index of the produced polyaluminum chloride product reaches the national standard requirements of new polyaluminum chloride with high alumina content, high basicity value, low water insoluble substance value and low heavy metal value, and the advantages of product diversification, low energy consumption and high productivity are realized.
Drawings
FIG. 1 is a flow chart of an evaporative concentration process designed by the present invention;
FIG. 2 is a flow chart of the vacuum cooling drying process designed by the present invention;
fig. 3 is a flow chart of a flash drying process designed by the invention.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
Example 1
The utility model provides a high-efficient environmental protection production system of solid polyaluminium chloride, includes the evaporation concentration system, vacuum cooling drying system and the flash drying system that connect gradually.
The evaporation concentration system is used for evaporating and concentrating the raw material liquid, so that the solid content of the raw material liquid is improved; the vacuum cooling and drying system has the effects that the raw material liquid is subjected to vacuum drying under a vacuum condition, so that the solid content of the raw material liquid is improved, and the raw material liquid can be prevented from generating chemical reaction to produce other impurities due to the impurities in the air, so that the purity of a product is influenced; the flash drying has the effect of further drying blocky polyaluminium chloride into powder, so that the transportation difficulty is reduced, and the dissolving speed of the polyaluminium chloride in the application process is increased.
As a further improvement, the evaporation concentration system comprises a three-effect counter-current evaporation system;
as shown in fig. 1, the triple-effect countercurrent evaporation system comprises a preheating device 1, a triple-effect unit, a triple-effect discharging device 5, a double-effect unit, a double-effect discharging device 9, a single-effect unit and a single-effect discharging device 13 which are connected in sequence. Wherein, the triple-effect countercurrent evaporation and concentration is an external circulation heater, and the evaporation capacity is 6.5T/h.
As a further improvement, the three-effect unit, the two-effect unit and the one-effect unit respectively comprise a separating device, a circulating device and a heating device which are sequentially connected.
As a further improvement, the heating devices of the three-effect unit and the two-effect unit are made of graphite, hastelloy or titanium materials; the heating device of the first effect unit is made of hastelloy or titanium; the separation device is made of glass fiber reinforced plastic, hastelloy or titanium material; the circulating device is made of polytetrafluoroethylene, Hastelloy or a titanium material; the three-effect discharging device, the two-effect discharging device and the one-effect discharging device are all made of polytetrafluoroethylene, Hastelloy or titanium materials.
As a further improvement, the triple-effect unit comprises a triple-effect separation device 2, a triple-effect circulation device 3 and a triple-effect heating device 4 which are connected in sequence; the double-effect unit comprises a double-effect separation device 6, a double-effect circulation device 7 and a double-effect heating device 8 which are connected in sequence; the first effect unit comprises a first effect separation device 10, a first effect circulation device 11 and a first effect heating device 12 which are connected in sequence.
Wherein, select triple effect countercurrent evaporation system for evaporation concentration, carry out cyclic utilization with the conduction oil, not only improved production efficiency, still reduced manufacturing cost and energy consumption, and have safe environmental protection's advantage.
As a further improvement, a feed inlet of the preheating device 1 is connected with an outlet of a raw material liquid pipeline, and a discharge outlet of the preheating device 1 is connected with a first feed inlet of the three-effect separation device 2; a first discharge port of the three-effect separation device 2 is connected with a feed port of the three-effect discharge device 5, and a second discharge port of the three-effect separation device 2 is connected with a feed port of the three-effect circulation device 3; the discharge hole of the three-effect circulating device 3 is connected with the feed inlet of the three-effect heating device 4; the discharge hole of the three-effect heating device 4 is connected with the second feed inlet of the three-effect separation device 2;
a discharge hole of the three-effect discharge device 5 is connected with a first feed hole of the two-effect separation device 6; a first discharge port of the two-effect separation device 6 is connected with a feed port of the two-effect discharge device 9, a second discharge port of the two-effect separation device 6 is connected with a feed port of the two-effect circulation device 7, and a steam outlet of the two-effect separation device 6 is connected with a steam inlet of the three-effect heating device 4; the discharge hole of the two-effect circulating device 7 is connected with the feed inlet of the two-effect heating device 8; the discharge hole of the two-effect heating device 8 is connected with the second feed inlet of the two-effect separation device 6;
a discharge hole of the secondary effect discharge device 9 is connected with a first feed hole of the primary effect separation device 10; a first discharge port of the first-effect separation device 10 is connected with a feed port of the first-effect discharge device 13, a second discharge port of the first-effect separation device 10 is connected with a feed port of the first-effect circulation device 11, and a steam outlet of the first-effect separation device 10 is connected with a steam inlet of the second-effect heating device 8; the discharge hole of the first effect circulating device 11 is connected with the feed inlet of the first effect heating device 12; the discharge hole of the first-effect heating device 12 is connected with the second feed hole of the first-effect separating device 10.
As a further improvement, the preheating device 1 is a preheater; the three-effect heating device 4, the two-effect heating device 8 and the one-effect heating device 12 are all circulating heaters; the three-effect circulating device 3, the two-effect circulating device 7 and the one-effect circulating device 11 are circulating pumps; the three-effect separation device 2, the two-effect separation device 6 and the one-effect separation device 10 are all separators.
As a further improvement, the evaporation concentration system also comprises a tail treatment system; the tail treatment system is connected with the three-effect countercurrent evaporation system; the tail treatment system comprises a first water storage device 17, a circulating water device 16, a surface condensing device 15 and a sewage treatment system 18 which are connected in sequence.
As a further improvement, the tail treatment system further comprises a vacuum pump 20 and a water cooling tower 19 arranged above the first water storage device 17; the vacuum pump 20 is connected to the surface condensing device 15.
As a further improvement, a first water inlet of the first water storage device 17 is connected with a tap water pipe, a water outlet of the first water storage device 17 is connected with a water inlet of the circulating water device 16, and a second water inlet of the first water storage device 17 is connected with a water outlet of the surface condensing device 15; the water outlet of the circulating water device 16 is connected with the water inlet of the surface condensing device 15; the steam inlet of the surface condensing device 15 is connected with the steam outlet of the three-effect separation device 2; a wastewater inlet of the sewage treatment system 18 is connected with a wastewater outlet of the surface condensing device 15, a condensed water outlet of the three-effect heating device 4 and a condensed water outlet of the two-effect heating device 8; the top end of the waste water outlet of the surface condensing device 15 is provided with an air outlet; the outlet is connected to the inlet of a vacuum pump 20. The vacuum pump is used for treating the non-condensable gas in the surface condensing device.
As a further improvement, the first water storage device 17 is a water tank; the circulating water device 16 is a circulating water pump; the surface condensing device 15 is a surface condenser.
As a further improvement, the evaporation concentration system also comprises a storage device 14; the storage devices 14 are connected with a three-effect countercurrent evaporation system and a vacuum cooling and drying system.
As a further improvement, the inlet of the storage device 14 is connected to the outlet of a first effect discharge device 13.
As a further improvement, the storage device 14 is a heat preservation storage tank.
As a further improvement, the system also comprises a natural gas heat transfer oil system; the natural gas heat conduction oil system comprises a high-temperature heat conduction oil area 21 and a low-temperature heat conduction oil area 22; the high-temperature heat-conducting oil area 21 is connected with a heat-conducting oil inlet end of the first-effect unit; the low-temperature heat conduction oil area 22 is connected with a heat conduction oil outlet end of the preheating device 1, a heat conduction oil outlet end of the first effect unit and a heat conduction oil outlet end of the storage device 14. Wherein the oil temperature at the outlet end of the high-temperature heat conduction oil zone is 220 ℃, and the oil temperature at the inlet end of the low-temperature heat conduction oil zone is 185 ℃.
As a further improvement, a heat conduction oil outlet of the high-temperature heat conduction oil area 21 is connected with a heat conduction oil inlet of the primary heating device 12; the heat conduction oil outlet of the primary heating device 12 is connected with the heat conduction oil inlet of the preheating device 1 and the heat conduction oil inlet of the storage device 14; the heat-conducting oil inlet of the low-temperature heat-conducting oil area 22 is connected with the heat-conducting oil outlet of the preheating device 1, the heat-conducting oil outlet of the first-effect heating device 12 and the heat-conducting oil outlet of the storage device 14.
As a further improvement, the natural gas heat-conducting oil system is a natural gas heat-conducting oil boiler. The original coal-fired heat conduction oil boiler is changed into a natural gas heat conduction oil boiler, so that the problems of environmental protection in coal-fired gas emission can be effectively solved, the emission amount of pollution factors is reduced, and the treatment cost is reduced.
As a further modification, as shown in fig. 2, the vacuum cooling and drying system includes a filtering device 23, a feeding device 24, a tube heating device 25 and a vacuum drying device 26, which are connected in sequence.
As a further improvement, the feed inlet of the filtering device 23 is connected with the discharge outlet of the storage device 14, and the discharge outlet of the filtering device 23 is connected with the feed inlet of the feeding device 24; the discharge hole of the feeding device 24 is connected with the feed hole of the tube array heating device 25; the discharge port of the tube array heating device 25 is connected with the feed port of the vacuum drying device 26.
As a further improvement, a heat conduction oil inlet of the tube array heating device 25 is connected with a heat conduction oil outlet of the high-temperature heat conduction oil area 21, and a heat conduction oil outlet of the tube array heating device 25 is connected with a heat conduction oil inlet of the material storage device 14.
As a further improvement, the filtering device 23 is a filter; the feeding device 24 is a feeding gear pump; the tube array heating device 25 is a tube array heater; the vacuum drying device 26 is a rotary blade vacuum dryer.
As a further improvement, a powder remover is arranged in the vacuum drying device; the vacuum degree in the vacuum drying device is-0.09 MPa; the feed rate to the vacuum drying apparatus was 6.5T/h.
As a further improvement, the vacuum cooling drying system also comprises a tailing processing system; the tailing processing system comprises a cyclone separation device 27, a mixing and condensing device 28, a spraying device 29 and a second water storage device 30 which are connected in sequence; the second water storage device 30 is connected with the mixing and condensing device 28.
As a further improvement, the tailing processing system further comprises a first water circulating device 33, a second water circulating device 32 and a third water circulating device 31; the first water circulating device 33 is connected with the spraying device 29 and the second water storage device 30; the second circulating water devices 32 are connected with the second water storage device 30 and the sewage treatment system 18; the third circulating water device 31 is connected with the mixed condensing device 28 and the second water storage device 30.
As a further improvement, the gas outlet of the vacuum drying device 26 is connected with the inlet of the cyclone separation device 27; the gas outlet of the cyclone separator 27 is connected with the inlet of the mixing and condensing device 28; the air outlet of the mixing and condensing device 28 is connected with the air inlet of the injection device 29; a first water inlet of the second water storage device 30 is connected with a tap water pipeline, a first water outlet of the second water storage device 30 is connected with a water inlet of the first circulating water device 33, a second water outlet of the second water storage device 30 is connected with a water inlet of the second circulating water device 32, and a third water outlet of the second water storage device 30 is connected with a water inlet of the third circulating water device 31; the water outlet of the first circulating water device 33 is connected with the water inlet of the spraying device 29; the water outlet of the spraying device 29 is connected with the second water inlet of the second water storage device 30; the water outlet of the second water circulating device 32 is connected with the wastewater inlet of the sewage treatment system 18; the water outlet of the third circulating water device 31 is connected with the water inlet of the mixed condensing device 28; the water outlet of the mixing and condensing device 28 is connected with the third water inlet of the second water storage device 30. Wherein, the material of the solid discharge port of the cyclone separation device 27 is used for recycling.
As a further improvement, the cyclonic separating apparatus 27 is a cyclone; the hybrid condenser unit 28 is an atmospheric condenser; the injection device 29 is a water injection pump; the second water storage device 30 is a water tank.
As a further improvement, a cooling tower 34 is provided on the second water storage device 30.
As a further improvement, the solid discharge port of the vacuum drying device 26 is provided with a twin-screw block discharging machine 35.
As a further improvement, a solid discharge port of the vacuum drying device is provided with a condensed water system; the water inlet of the condensed water system is connected with the tap water pipeline, and the water outlet of the condensed water system is connected with the third water inlet of the second water storage device 30.
The equipment parameters of the vacuum drying system designed in this example are shown in table 1.
TABLE 1 summary of equipment parameters for vacuum drying system
As a further improvement, as shown in fig. 3, the flash drying system comprises a blower device 36, an air heating device 37, a flash evaporation device 38, a first cyclone separation device 39, a second cyclone separation device 40, an induced air device 41 and a washing device 42 which are connected in sequence.
As a further improvement, the air inlet of the air blowing device 36 is connected with air, and the air outlet of the air blowing device 36 is connected with the air inlet of the air heating device 37; the air outlet of the air heating device 37 is connected with the air inlet of the flash evaporation device 38; the feed inlet of the flash evaporation device 38 is connected with the solid discharge outlet of the vacuum cooling and drying system, and the discharge outlet of the flash evaporation device 38 is connected with the feed inlet of the first cyclone separation device 39; the second discharge hole of the first cyclone separation device 39 is connected with the feed hole of the second cyclone separation device 40; the air outlet of the second cyclone separation device 40 is connected with the air inlet of the induced draft device 41; the air outlet of the induced draft device 41 is connected with the air inlet of the washing device 42.
As a further improvement, a first discharge port of the first cyclone separation device 39 is a powder product outlet; the discharge port of the second cyclone device 40 is a product outlet of the powder industry.
As a further improvement, the air blowing device 36 is an air blower; the air heating device 37 is an air heater; the flash unit 38 is a flash column; the first and second cyclonic separating apparatus 39, 40 are both cyclonic separators; the induced draft device 41 is an induced draft fan; the scrubber 42 is a spray scrubber.
As a further improvement, the washing device 42 further comprises an exhaust device 44 and a fourth water circulating device 43 which are arranged at the top of the washing device 42; the water inlet of the fourth circulating water device 43 is connected with the tap water pipeline and the water outlet of the washing device 42, and the water outlet of the fourth circulating water device 43 is connected with the first water inlet and the second water inlet of the washing device 42; the material at the discharge port of the washing device 42 is recycled.
The technical process of the raw materials in the high-efficiency environment-friendly production system of the solid polyaluminium chloride designed by the embodiment is as follows:
1) feeding polyaluminium chloride raw material liquid with the solid content of 30%, the pH value of 2.5-3.6, the feeding amount of 13T/h and the feeding temperature of 70-90 ℃ into a preheating device for preheating, feeding the preheated polyaluminium chloride raw material liquid into a three-effect separation device for separation, feeding the separated three-stage polyaluminium chloride raw material liquid into a three-effect discharging device, feeding the non-separated polyaluminium chloride raw material liquid into a three-effect circulation device, feeding the non-separated polyaluminium chloride raw material liquid into a three-effect heating device through the three-effect circulation device, heating the non-separated polyaluminium chloride raw material liquid through the heating device, and feeding the heated polyaluminium chloride raw material liquid into the; the tertiary polyaluminium chloride feed liquid fed into the triple-effect discharging device is fed into the double-effect separating device through the triple-effect discharging device, the separated secondary polyaluminium chloride feed liquid is fed into the double-effect discharging device, the non-separated polyaluminium chloride feed liquid is fed into the double-effect circulating device, then is fed into the double-effect heating device through the double-effect circulating device, is heated through the heating device and then is fed into the double-effect separating device for re-separation; feeding the second-stage polyaluminium chloride feed liquid fed into the second-stage discharging device into the first-stage separating device through the second-stage discharging device, feeding the separated first-stage polyaluminium chloride feed liquid into the first-stage discharging device, feeding the unseparated polyaluminium chloride feed liquid into the first-stage circulating device, feeding the unseparated polyaluminium chloride feed liquid into the first-stage heating device through the first-stage circulating device, heating the unseparated polyaluminium chloride feed liquid through the heating device, and feeding the heated polyaluminium chloride feed liquid into the first-stage separating device for re-separation; the primary polyaluminum chloride feed liquid sent into the primary discharging device is sent into a storage device through the primary discharging device for storage, the obtained primary polyaluminum chloride feed liquid is a polyaluminum chloride feed liquid with the solid content of 60% and the pH value of 2.5-3.6, wherein the discharge amount of the primary discharging device is 6.5T/h, and the discharge temperature is 100-110 ℃;
2) feeding polyaluminium chloride feed liquid with the solid content of 60 percent and the pH value of 2.5-3.6 in a storage device, wherein the feeding amount is 6.5T/h and the feeding temperature is 110 ℃ into a filtering device for filtering, feeding the filtered polyaluminium chloride feed liquid into a tubular heating device through a feeding device for heating, feeding the polyaluminium chloride feed liquid into a vacuum drying device for drying, and treating the polyaluminium chloride feed liquid through a double-screw block discharging machine at an outlet end to obtain blocky polyaluminium chloride with the solid content of 72 percent, wherein the discharging amount of the double-screw block discharging machine is 5.4T/h, and the discharging temperature is 45-55 ℃; the gas mixture dried by the vacuum drying device is sent into a cyclone separation device for separation, the separated precipitate is recycled, the separated gas mixture is sent into a mixing and condensing device for condensation treatment, the obtained liquid is sent into a water storage device for recycling, the obtained gas is sent into an injection device for recycling, and finally the gas is sent into the water storage device for recycling;
3) sending 72% blocky polyaluminium chloride dried and cooled by the vacuum cooling and drying device into a flash evaporation device, then sending air into an air heating device through an air blowing device for heating, and sending hot air into the bottom of the flash evaporation device for drying blocky polyaluminium chloride; and feeding the dried mixture into a first cyclone separation device for separation to obtain a powder product with the solid content of 91-94%, feeding the unseparated mixture into a second cyclone separation device for re-separation, wherein the separated solid is a powder industrial product, feeding the unseparated mixture into a washing tower by an air inducing device for washing, discharging the washed gas into the atmosphere through an exhaust device, and recycling the washed liquid.
After the system designed by the embodiment of the liquid polyaluminium chloride is used for treatment, the quality index can reach high alumina content, high basicity value, low water insoluble substance value and low heavy metal value, and all meet the new national standard of polyaluminium chloride. Specific technical indexes are shown in table 2.
TABLE 2 quality index of "polyaluminium chloride for Drinking Water", GB 15892-
The technological process of the heat conducting oil in the high-efficiency environment-friendly production system of the solid polyaluminium chloride designed by the invention comprises the following steps:
heating heat conducting oil through natural gas, and then sending the heat conducting oil in a high-temperature area into a first-effect heating device in an evaporation concentration system and a tube array heating device of a vacuum cooling drying system; part of the heat conduction oil with the reduced temperature after passing through the first-effect heating device returns to the low-temperature heat conduction oil area for reheating, part of the heat conduction oil is respectively sent to the preheating device and the storage device for recycling, and the heat conduction oil with the reduced temperature after passing through the preheating device and the storage device returns to the low-temperature heat conduction oil area for reheating; and returning part of the heat conduction oil with the reduced temperature after passing through the tube array heating device in the vacuum cooling and drying system to the low-temperature heat conduction oil area for reheating, and sending part of the heat conduction oil to the material storage device for recycling.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The utility model provides a high-efficient environmental protection production system of solid polyaluminium chloride which characterized in that, evaporation concentration system, vacuum cooling drying system and flash drying system that connect gradually.
2. The system for efficient and environmentally friendly production of solid polyaluminum chloride of claim 1, wherein said evaporative concentration system comprises a triple-effect counter-current evaporation system;
the triple-effect countercurrent evaporation system is sequentially connected with the preheating device, the triple-effect unit, the triple-effect discharging device, the double-effect unit, the double-effect discharging device, the first-effect unit and the first-effect discharging device;
the three-effect unit, the two-effect unit and the one-effect unit respectively comprise a separating device, a circulating device and a heating device which are sequentially connected.
3. The system for the efficient and environment-friendly production of solid polyaluminium chloride as claimed in claim 2, wherein the heating devices of the three-effect unit and the two-effect unit are made of graphite, hastelloy or titanium material; the heating device of the first effect unit is made of hastelloy or titanium; the separation device is made of glass fiber reinforced plastic, hastelloy or titanium material; the circulating device is made of polytetrafluoroethylene, Hastelloy or a titanium material; the three-effect discharging device, the two-effect discharging device and the one-effect discharging device are all made of polytetrafluoroethylene, Hastelloy or titanium materials.
4. The system for efficient and environmentally friendly production of solid polyaluminum chloride of claim 2, wherein said evaporative concentration system further comprises a tail treatment system; the tail treatment system is connected with a three-effect countercurrent evaporation system; the tail treatment system comprises a first water storage device, a circulating water device, a surface condensing device and a sewage treatment system which are connected in sequence.
5. The system for efficient and environmentally friendly production of solid polyaluminum chloride according to claim 2, wherein said evaporative concentration system further comprises a storage device; and the storage devices are connected with a triple-effect countercurrent evaporation system and a vacuum cooling and drying system.
6. The system for efficient and environmentally friendly production of solid polyaluminum chloride of claim 5, further comprising a natural gas thermal oil system; the natural gas heat conduction oil system comprises a high-temperature heat conduction oil area and a low-temperature heat conduction oil area; the high-temperature heat conduction oil area is connected with a heat conduction oil inlet end of the first-effect unit; the low-temperature heat conduction oil area is connected with a heat conduction oil outlet end of the preheating device, a heat conduction oil outlet end of the first effect unit and a material storage device.
7. The efficient and environment-friendly production system of solid polyaluminium chloride as claimed in claim 4, wherein the vacuum cooling and drying system comprises a filtering device, a feeding device, a tube array heating device and a vacuum drying device which are connected in sequence; the vacuum cooling drying system also comprises a tailing processing system; the tailing processing system comprises a cyclone separation device, a mixing and condensing device, an injection device and a second water storage device which are connected in sequence; the mixed condensing device is connected with the second water storage device.
8. The system for high-efficiency and environment-friendly production of solid polyaluminium chloride as claimed in claim 7, wherein a powder remover is arranged in the vacuum drying device; the vacuum degree in the vacuum drying device is between-0.092 MPa and-0.085 MPa; the feeding amount of the vacuum drying device is 6.5-7.5T/h.
9. The system for efficient and environment-friendly production of solid polyaluminum chloride according to claim 7, wherein the tailing disposal system further comprises a first water circulating device, a second water circulating device and a third water circulating device; the first circulating water devices are connected with the spraying device and the second water storage device; the second circulating water devices are connected with the second water storage device and the sewage treatment system; and the third circulating water devices are connected with the mixed condensing device and the second water storage device.
10. The efficient and environment-friendly production system of solid polyaluminium chloride as claimed in claim 1, wherein the flash drying system comprises an air blowing device, an air heating device, a flash evaporation device, a first cyclone separation device, a second cyclone separation device, an induced air device and a washing device which are connected in sequence.
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